1 /*
  2  * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
  3  * Copyright (c) 2015, Red Hat Inc.
  4  * Copyright (c) 2021, Huawei Technologies Co., Ltd. All rights reserved.
  5  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  6  *
  7  * This code is free software; you can redistribute it and/or modify it
  8  * under the terms of the GNU General Public License version 2 only, as
  9  * published by the Free Software Foundation.
 10  *
 11  * This code is distributed in the hope that it will be useful, but WITHOUT
 12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 14  * version 2 for more details (a copy is included in the LICENSE file that
 15  * accompanied this code).
 16  *
 17  * You should have received a copy of the GNU General Public License version
 18  * 2 along with this work; if not, write to the Free Software Foundation,
 19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 20  *
 21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 22  * or visit www.oracle.com if you need additional information or have any
 23  * questions.
 24  *
 25  */
 26 
 27 package sun.jvm.hotspot.debugger.riscv64;
 28 
 29 import java.lang.annotation.Native;
 30 
 31 import sun.jvm.hotspot.debugger.*;
 32 import sun.jvm.hotspot.debugger.cdbg.*;
 33 
 34 /** Specifies the thread context on riscv64 platforms; only a sub-portion
 35  * of the context is guaranteed to be present on all operating
 36  * systems. */
 37 
 38 public abstract class RISCV64ThreadContext implements ThreadContext {
 39     // Taken from /usr/include/asm/sigcontext.h on Linux/RISCV64.
 40 
 41     //  /*
 42     //   * Signal context structure - contains all info to do with the state
 43     //   * before the signal handler was invoked.
 44     //   */
 45     // struct sigcontext {
 46     //   struct user_regs_struct sc_regs;
 47     //   union __riscv_fp_state sc_fpregs;
 48     // };
 49     // 
 50     // struct user_regs_struct {
 51     //    unsigned long pc;
 52     //    unsigned long ra;
 53     //    unsigned long sp;
 54     //    unsigned long gp;
 55     //    unsigned long tp;
 56     //    unsigned long t0;
 57     //    unsigned long t1;
 58     //    unsigned long t2;
 59     //    unsigned long s0;
 60     //    unsigned long s1;
 61     //    unsigned long a0;
 62     //    unsigned long a1;
 63     //    unsigned long a2;
 64     //    unsigned long a3;
 65     //    unsigned long a4;
 66     //    unsigned long a5;
 67     //    unsigned long a6;
 68     //    unsigned long a7;
 69     //    unsigned long s2;
 70     //    unsigned long s3;
 71     //    unsigned long s4;
 72     //    unsigned long s5;
 73     //    unsigned long s6;
 74     //    unsigned long s7;
 75     //    unsigned long s8;
 76     //    unsigned long s9;
 77     //    unsigned long s10;
 78     //    unsigned long s11;
 79     //    unsigned long t3;
 80     //    unsigned long t4;
 81     //    unsigned long t5;
 82     //    unsigned long t6;
 83     // };
 84 
 85     // NOTE: the indices for the various registers must be maintained as
 86     // listed across various operating systems. However, only a small
 87     // subset of the registers' values are guaranteed to be present (and
 88     // must be present for the SA's stack walking to work)
 89 
 90     // One instance of the Native annotation is enough to trigger header generation
 91     // for this file.
 92     @Native
 93     public static final int R0 = 0;
 94     public static final int R1 = 1;
 95     public static final int R2 = 2;
 96     public static final int R3 = 3;
 97     public static final int R4 = 4;
 98     public static final int R5 = 5;
 99     public static final int R6 = 6;
100     public static final int R7 = 7;
101     public static final int R8 = 8;
102     public static final int R9 = 9;
103     public static final int R10 = 10;
104     public static final int R11 = 11;
105     public static final int R12 = 12;
106     public static final int R13 = 13;
107     public static final int R14 = 14;
108     public static final int R15 = 15;
109     public static final int R16 = 16;
110     public static final int R17 = 17;
111     public static final int R18 = 18;
112     public static final int R19 = 19;
113     public static final int R20 = 20;
114     public static final int R21 = 21;
115     public static final int R22 = 22;
116     public static final int R23 = 23;
117     public static final int R24 = 24;
118     public static final int R25 = 25;
119     public static final int R26 = 26;
120     public static final int R27 = 27;
121     public static final int R28 = 28;
122     public static final int R29 = 29;
123     public static final int R30 = 30;
124     public static final int R31 = 31;
125 
126     public static final int NPRGREG = 32;
127 
128     public static final int PC = R0;
129     public static final int LR = R1;
130     public static final int SP = R2;
131     public static final int FP = R8;
132 
133     private long[] data;
134 
135     public RISCV64ThreadContext() {
136         data = new long[NPRGREG];
137     }
138 
139     public int getNumRegisters() {
140         return NPRGREG;
141     }
142 
143     public String getRegisterName(int index) {
144         switch (index) {
145         case LR: return "lr";
146         case SP: return "sp";
147         case PC: return "pc";
148         default:
149             return "r" + index;
150         }
151     }
152 
153     public void setRegister(int index, long value) {
154         data[index] = value;
155     }
156 
157     public long getRegister(int index) {
158         return data[index];
159     }
160 
161     public CFrame getTopFrame(Debugger dbg) {
162         return null;
163     }
164 
165     /** This can't be implemented in this class since we would have to
166      * tie the implementation to, for example, the debugging system */
167     public abstract void setRegisterAsAddress(int index, Address value);
168 
169     /** This can't be implemented in this class since we would have to
170      * tie the implementation to, for example, the debugging system */
171     public abstract Address getRegisterAsAddress(int index);
172 }